Enoch robinson



A'IET OFFICE.

t UNITED STATES ENOGH ROBINSON, `OF BOSTON, MASSACHUSETTS.

WINDLASS OR DRUM FOR RAISING WEIGHTS.

Speccaton of Letters Patent No. 2,473, dated February 28, 1842.

` which a. heavy body is elevated or drawn in any direction. and towhich windlasses o-r drums or articles the elevating or `moving power isapplied unequally during their revolutions on their axes, and that thefollowing is a full and exact description of the same, whichdescription, taken in connection with the drawings therein referred to,forms my specification, wherein I have set forth the nature andprinciples of my improvement, by which it may be distinguished fromothers of a similar character and such portion of the same as I claimand for which I solicit Letters Patent.

In the accompanying drawings Figure l,

represents a front elevat-ion of a windlass having my improvement Fig.2, is an end view and Fig. 3, is a vertical and transverse section.

My improvement consists in making the barrel A on which the rope iswound elliptical or oval in its transverse section, or having itsdiameter in o-ne direction or from a to b larger than that in theopposite or from c to (Z as represented' in Fig. 3. The cranks B, C, bywhich the barrel is turned are arranged in the plane of the largestdiameter or a b.

The windlass being turned by the operatives acting on the cranks, theyexert the least power on the same when the cranks are in their highestor lowest positions or at or near the points D, E Fig. 2, and thegreatest when they are at or near the points F G or while the cranks arehorizontal. lVhen t-he cranks are upright or the leastpower is exertedthe rope is winding over the flat portions c, (Z, Fig. 3, of the barrel,with the small opposing leverage of half the shorter axis of theelliptical section, and when they are horizontal the rope is being woundover the portions a, b, and is opposed by the vleverage of half thelonger axis of the elliptical section. rIherefore as the power of theworkman decreases it is applied to the same advantage as when exerted toits greatest effect, and thus by a windlass constructed in this manner agreater weight can be elevated than if made circular in cross section.

I shall claim as my invention- Constructing the barrel on which the ropeis wound, elliptical or oval in its cross section or having its diameterin one direction greater than in the opposite direction, and arrangingthe cranks of said barrel in the plane of its longest diameter, thewhole being for the object abo-ve specified.

In testimony that the foregoing is a true description of my saidinvention and improvements I have hereto set my signature thistwenty-eight day of December in the year eighteen hundred and forty.

ENOCH ROBINSON.

Vitnesses:

R. N. EDDY, JOHN NOBLE,

